I do believe in the resurrection of the dead and those still alive when He returns. But that can't be considered post trib. doctrine really because post trib. says the tribulation is still to come. I believe the tribulation spoken of already happened to Israel, I don't see that happening again. Why would it?
The tribulation happened when they did not accept the Messiah Jesus and the temple, Jerusalem, and other towns were destroyed by the Romans. The people, the Jews that had not received the Messiah as their Savior, were displaced all over the world at that time. The end of the Mosaic age of the temple and blood sacrifice of bulls and goats ended.
The book of Hebrews, Jesus, Paul, and Peter all tell the Christians of that day, that it was coming soon, the end of the Mosaic age, and it did. Jesus said some of them standing there would live to see it and some of them did. That is what Jesus literally said, so that is what I believe.
People believe the history that is written about Hitler destroying the Jews, they read and believe what is happening in Israel right now, but people don't read and believe the history written about the destruction of Israel that was written by an eye witness, a Jew, in 70 AD, why is that? I find that very confusing.
The tribulation is when satan pretends to be Christ,ie,the Abomination of desolation,better stated the desolator
Matthew 24:15 "When ye therefore shall see the abomination of desolation, spoken of by Daniel the prophet, stand in the holy place (whoso readeth, let him understand"
The "abomination" is when Satan stands in Jerusalem, and proclaims that he is God, and the world believes it. The "desolation" is an incorrect translation into the English, which should read "desolator", and Satan is the desolator that will make the claim that he is God, the true Christ. "Desolation" is a condition, in the Hebrew manuscripts it is written, "On the wings of the desolator," this is not a condition, but a entity, a person. It is through this individual, Satan that the abomination shall come from. It is the desolator [Satan] that shall cause all but the sealed of God, to become desolate, or deceived.
Daniel 9:27; "And he shall confirm the covenant with many for one week: and in the midst of the week he shall cause the sacrifice and the oblation to cease, and for the overspreading of abominations he shall make it desolate, even until the consummation, and the determined shall be poured upon the desolate."
The Holy place is the place that the temple sits, and this is the subject for the very first, when the buildings of the temple were observed by the disciples, and the question of what it would be like at His second advent. This is where the desolation [Satan, the Antichrist] shall sit on mount Zion, making his abominations, or statements that he is the Christ.